CN117345553A - Web, manufacturing method of web, fan blade and wind generating set - Google Patents

Abstract

The invention provides a web, a web manufacturing method, a wind turbine blade and a wind power generator set. The web includes a core material and reinforcement portions respectively provided on both sides of the core material. The reinforcement portions include a polydicyclopentadiene resin matrix and a reinforcement layer provided in the polydicyclopentadiene resin matrix. The web according to the present invention has low manufacturing cost, high manufacturing efficiency and light weight.

Description

Web, web manufacturing method, wind turbine blade and wind turbine

Technical field

The present invention relates to the technical field of wind power generation, and in particular designs a web, a web manufacturing method, a wind turbine blade and a wind power generator set.

Background technique

At present, the web of wind turbine blades is mainly a sandwich structure composed of a two-component epoxy resin system infused with glass fiber fabric and core material.

Epoxy resin is a polymer containing more than two epoxy groups in the molecule. It is commonly formed by the condensation polymerization of bisphenol A, epichlorohydrin, polyols, etc. As the raw materials for making epoxy resin have increased significantly in price, the cost of wind turbine blades has also increased significantly.

In addition, due to the high viscosity of epoxy resin at room temperature (200cps-300cps), the infusion time of large-thickness parts is longer, which increases the infusion time of the entire blade web, and the infusion time is longer in thicker parts of the blade web parts. Long, usually takes 1-2 hours. In addition, the epoxy resin system needs to be post-cured, and the post-curing period is 6-7 hours at 70°C. Therefore, the production efficiency of manufacturing blade webs using epoxy resin systems is low.

Contents of the invention

The object of the present invention is to provide a web with low manufacturing cost, high manufacturing efficiency and light weight.

Another object of the present invention is to provide a method for manufacturing a web that can solve the process problem of whitening due to poor wetting when using polydicyclopentadiene resin to form the web.

According to an aspect of the present invention, a web is provided. The web includes a core material and reinforcing parts respectively provided on both sides of the core material. The reinforcing parts include a polydicyclopentadiene resin matrix and a reinforcing part provided on both sides of the core material. The reinforcing layer in the polydicyclopentadiene resin matrix.

Optionally, the reinforcing layer includes at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber and flax fiber.

Optionally, the core material includes at least one of holes and grooves, and the polydicyclopentadiene resin matrix extends into the holes and/or grooves.

Optionally, the core material includes a first core material and a second core material, the second core material is located at the lifting point of the web, and the strength of the second core material is greater than that of the first core material Strength of.

According to another aspect of the present invention, a method for manufacturing a web is provided. The manufacturing method includes: laying a core material and a reinforcement layer in a web mold, with the reinforcement layer being provided on both sides of the core material; and injecting resin. , the resin is a polydicyclopentadiene resin system; the resin is cured.

Optionally, the step of injecting the resin includes: arranging a vacuum system outside the web mold; evacuation and injecting the resin after evacuation, wherein the resin infusion temperature is 25°C-35°C.

Optionally, the step of curing the resin includes: maintaining the temperature at 40-60°C for 1-2 hours and then raising the temperature to 80-85°C and maintaining the temperature for 3-4 hours.

Optionally, the step of vacuuming includes: setting the vacuum degree to 0.5-0.8 atmospheres before the resin filling amount reaches half.

Optionally, the diameter of the tube into which the resin is poured is 5-20 mm.

Optionally, when injecting the resin, the infusion rate of the resin is gradually increased.

Optionally, the polydicyclopentadiene resin system includes dicyclopentadiene or dicyclopentadiene prepolymer, and the polydicyclopentadiene resin system further includes a catalyst, based on 100 parts by weight of dicyclopentadiene or Dicyclopentadiene prepolymer, the catalyst content is 0.01-5 parts by weight.

Optionally, the dicyclopentadiene prepolymer is formed from dicyclopentadiene and an elastomer, and the weight ratio of the elastomer to dicyclopentadiene is 0.01-0.7.

Optionally, the catalyst includes a ruthenium catalyst, a classic two-component catalyst, a molybdenum phenolic compound or a tungsten-triphenylphosphine series complex, and the elastomer includes a thermoplastic elastomer.

Optionally, the manufacturing method of the polydicyclopentadiene resin system includes: before injecting the resin, dividing dicyclopentadiene or dicyclopentadiene prepolymer and catalyst into component A and component B, said A The component is dicyclopentadiene or dicyclopentadiene prepolymer and the B component is a catalyst, or the A component is a part of dicyclopentadiene or dicyclopentadiene prepolymer and the B component Separate into the catalyst and the remainder of dicyclopentadiene or dicyclopentadiene prepolymer; degas the A component and the B component respectively, and then mix.

According to another aspect of the invention, a wind turbine blade is provided, the wind turbine blade comprising a web as described above.

According to yet another aspect of the present invention, a wind power generator set is provided, which wind power generator set includes the wind turbine blade as described above.

According to the present invention, the cost of the polydicyclopentadiene resin system (assembly) used for the polydicyclopentadiene resin matrix is more than 30% cheaper than the epoxy resin system, and each blade web can save 10,000 to 30,000 yuan. , the cost reduction effect is obvious.

According to the present invention, the polydicyclopentadiene resin system is used to infuse the reinforcement layer and core material to make the web. Since the polydicyclopentadiene resin system has a low viscosity at room temperature, only 10 to 100 cps, the infusion speed is very fast and the web can be shortened. The plate perfusion time is approximately 0.5-1.5 hours.

According to the present invention, the polydicyclopentadiene resin does not require post-curing, the curing time is short, and the production efficiency can be greatly improved.

According to the present invention, the density of the polydicyclopentadiene resin system (assembly) is 1.03-1.05g/cm ³ , the density after curing is smaller than the density after curing of the epoxy resin system, and the web is 3-3 light in weight 5%, thus achieving lightweight blades.

In addition, according to the present invention, a method is provided that can solve the process problem of whitening caused by poor wetting when using polydicyclopentadiene resin to form a web.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

Figure 1 is an exploded schematic diagram of a portion of a blade according to an embodiment of the invention;

Figure 2 is a schematic diagram of main beams and webs according to an embodiment of the present invention;

Figure 3 is a schematic diagram of a web according to an embodiment of the invention;

Figure 4 is a cross-sectional view taken along line A-A of Figure 3;

FIG. 5 is a schematic diagram illustrating a method of manufacturing a web according to an embodiment of the present invention.

In the drawings: 101 is the first shell, 102 is the second shell, 10 is the web, 20 is the main beam, 11 is the reinforcement, 12 is the core material, 12a is the first core material, 12b is the second For the core material, 31 is an integrated perfusion system, 32 is a vacuum system, 33 is a web mold, 34 is a first valve, 35 is a second valve, and 36 is a temperature sensor.

Detailed ways

Hereinafter, a web, a web manufacturing method, a wind turbine blade and a wind turbine set according to embodiments of the present invention will be described with reference to FIGS. 1 to 5 .

Figure 1 is an exploded schematic representation of a portion of a blade according to an embodiment of the invention. As shown in FIG. 1 , the blade may include a first housing 101 and a second housing 102 . In the installed blade, the first shell 101 and the second shell 102 can be combined with each other to form a complete shell, providing a geometric airfoil through which the airflow passes.

According to embodiments of the invention, the blade may include a web 10 . The web 10 may be supported between the first shell 101 and the second shell 102 for bearing shear forces and bending moments. Alternatively, the blade may comprise two webs 10 separated from each other. However, the number of webs 10 is not particularly limited.

According to embodiments of the present invention, the blade may further include a main beam 20 . The main beam 20 may be provided in the first housing 101 and the second housing 102 as a load-bearing component. The blade may include two main beams 20 provided in the first housing 101 and the second housing 102 respectively.

Figure 2 is a schematic diagram of main beams and webs according to an embodiment of the present invention. As shown in FIG. 2 , the two main beams 20 are opposite to each other in the thickness direction of the blade, and the two webs 10 are opposite to each other in the chord direction of the blade and support the two main beams 20 .

Hereinafter, a web according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4 . 3 is a schematic diagram of a web according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3 .

As shown in FIGS. 3 and 4 , the web 10 according to the embodiment of the present invention may include a core material 12 and reinforcement portions 11 respectively provided on both sides of the core material 12 .

According to an embodiment of the present invention, the reinforcing parts 11 provided on both sides of the core material 12 are combined together at both ends of the core material 12 and turned over to form a bonding flange, so that the web 10 forms a structure similar to a C-shape or a T-shape. , to provide blade strength and stiffness. However, the shape of the web 10 is not particularly limited.

According to an embodiment of the present invention, the reinforcing part 11 may include a polydicyclopentadiene resin matrix and a reinforcing layer disposed in the polydicyclopentadiene resin matrix. According to the present invention, by applying a polydicyclopentadiene resin matrix in the reinforced part 11, at least one of the following technical effects can be achieved: 1. Polydicyclopentadiene resin system (composite material) (polydicyclopentadiene resin system) The cost of polyethylene resin, which forms a polydicyclopentadiene resin matrix after infusion and solidification, is more than 30% cheaper than the epoxy resin system. Each blade web can save 10,000 to 30,000 yuan, and the cost reduction effect is obvious; 2. When using the polydicyclopentadiene resin system (composite material) to infuse the reinforcement layer and core material to make the web, the polydicyclopentadiene resin system (composition material) has a low viscosity at room temperature, only 10 to 100 cps, so the infusion speed is very It is fast and can shorten the infusion time of the web by about 0.5-1.5 hours; 3. Polydicyclopentadiene resin does not require post-curing, and the curing time is short, which can greatly improve production efficiency; 4. Polydicyclopentadiene resin system (combination The density of the material) is 1.03-1.05g/cm ³ , and the density after curing is smaller than the density after curing of the epoxy resin system. The weight of the web produced is 3-5% lighter, thereby achieving lightweight blades.

According to embodiments of the present invention, the polydicyclopentadiene resin matrix can be made using a polydicyclopentadiene resin system (composition). Polydicyclopentadiene (PDCPD) resin system is a polymer IPN alloy material copolymerized by catalyst, dicyclopentadiene (DCPD) or dicyclopentadiene (DCPD) prepolymer. It has low density, good toughness, and ease of use. It has the characteristics of fast filling and curing speed.

According to embodiments of the present invention, the polydicyclopentadiene resin system may include dicyclopentadiene or dicyclopentadiene prepolymer. Dicyclopentadiene prepolymer is formed by modifying dicyclopentadiene with an elastomer. By modifying dicyclopentadiene, the molecular weight can be increased and performance improved.

According to embodiments of the present invention, the weight ratio of elastomer to dicyclopentadiene is 0.01-0.7. When the weight ratio of the elastomer to dicyclopentadiene is less than 0.01, the added amount of the elastomer is too small, and the effect of modifying dicyclopentadiene is not obvious. When the weight ratio of elastomer to dicyclopentadiene reaches 0.7, the effect of modifying dicyclopentadiene is already significant, and when the weight ratio of elastomer to dicyclopentadiene exceeds 0.7, the effect of modifying dicyclopentadiene The effect of modification is no longer significantly improved, but will instead affect the amount of dicyclopentadiene, thus affecting the performance of dicyclopentadiene as the main agent.

According to embodiments of the present invention, the elastomer may be a thermoplastic elastomer (TPE or TPR). Alternatively, the elastomer may be SBS (styrenic thermoplastic elastomer), SEBS (saturated SBS), PS (polystyrene), TPS (styrenic thermoplastic elastomer), TPV (thermoplastic ethylene propylene diene monomer) Any one of dynamic vulcanized elastomer), TPEE (thermoplastic polyester elastomer) and TPU (main thermoplastic polyurethane elastomer rubber).

According to embodiments of the present invention, the polydicyclopentadiene resin system may further include a catalyst. The content of the catalyst is 0.01-5 parts by weight based on 100 parts by weight of dicyclopentadiene or dicyclopentadiene prepolymer. According to the present invention, by adding a catalyst to the dicyclopentadiene prepolymer, it can play a catalytic polymerization role in the polymerization reaction of the dicyclopentadiene prepolymer.

When the added amount of catalyst is less than 0.01 parts by weight based on 100 parts by weight of dicyclopentadiene or dicyclopentadiene prepolymer, the added amount of catalyst is too small and cannot fully exert its effect on dicyclopentadiene or dicyclopentadiene prepolymer. catalytic polymerization of polymers. When the addition amount of the catalyst is greater than 5 parts by weight based on 100 parts by weight of dicyclopentadiene or dicyclopentadiene prepolymer, the effect on the catalytic polymerization of dicyclopentadiene or dicyclopentadiene prepolymer is no longer obvious. Increasing the amount will, on the contrary, affect the amount of dicyclopentadiene or dicyclopentadiene prepolymer, thus affecting the performance of dicyclopentadiene or dicyclopentadiene prepolymer as the main agent.

According to embodiments of the present invention, the catalyst may include a ruthenium catalyst, a classic two-component catalyst, a molybdenum phenolic compound, or a tungsten-triphenylphosphine series complex, etc. The ruthenium catalyst can be Grubbs first generation or Grubbs second generation. The first component (main catalyst) in a classic two-component catalyst is a complex of W, Mo, Ru, Ti, Re, etc., and the second component is a metal organic compound such as Al, Mg, Sn, Zn, Si, etc. The molybdenum phenolic compound may be, for example, tris-p-methylphenoxymolybdenum dichloride, tris(2,4-di-tert-butyl-6-methylphenoxy)molybdenum dichloride, trinonylphenoxydichloride Molybdenum oxide, etc.

According to embodiments of the present invention, the reinforcing part 11 may further include a reinforcing layer disposed in a polydicyclopentadiene resin matrix to improve the strength and stiffness of the web 10 . According to embodiments of the present invention, the reinforcing layer may include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber and flax fiber.

As an example, the reinforcing layer may use at least one of the following fibers: glass fiber (including biaxial fabrics with a weight of 800-1200g/ ^m2 ), biaxial carbon fiber fabrics (including biaxial fabrics with a weight of 100g/ ^m2) -2000g/m ² multi-axial fabric), carbon-glass hybrid fabric (including intra-layer hybrid and inter-layer hybrid fabrics, gram weight is 100g/m ² -2000g/m ² , carbon fiber hybrid weight ratio is 1%-99 %), basalt fiber fabrics (including biaxial fabrics and multiaxial fabrics with a weight of 100g/ ^m2-2000g / ^m2 ), aramid fiber fabrics (including biaxial fabrics with a weight of 100g/ ^m2-2000g / ^m2 biaxial fabrics and multiaxial fabrics), linen and other natural fiber fabrics (including biaxial fabrics and multiaxial fabrics with a weight of 100g/ ^m2-2000g / ^m2 ).

The web 10 according to embodiments of the present invention may include a core 12 sandwiched between reinforcements 11 . In order to improve the bonding strength between the core material 12 and the reinforcement 11 , the core material 12 may include at least one of holes and grooves. When infusing the polydicyclopentadiene resin system (used to form the polydicyclopentadiene resin matrix), the polydicyclopentadiene resin system flows into the holes and/or grooves and solidifies during the subsequent curing process. Therefore, the polydicyclopentadiene resin matrix according to the present invention can extend into the holes and/or grooves to form an anchor-like structure to improve the bonding strength between the core material 12 and the reinforcement 11 . As an example, the groove may be in a straight shape or a cross shape, however, the form of the groove is not limited thereto.

According to embodiments of the present invention, the core material 12 may be at least one of PET foam, HPE foam, PVC foam, SAN foam and balsa wood. The main component of PET foam is polyethylene terephthalate, commonly known as polyester resin, which has good heat resistance, mechanical strength and environmental protection performance. HPE foam refers to a new type of rigid foam with an interpenetrating polymer network formed by blending and foaming dicyclopentadiene and polyether. It has small cell size, low glue absorption, is environmentally friendly and recyclable, has good toughness, and has outstanding anti-resistance properties. Fatigue performance. PVC foam is made of polyvinyl chloride resin as the main body, adding foaming agent and other additives. It is an early-used foam plastic and is divided into hard and soft. The PVC foam used in the present invention may be cross-linked rigid PVC foam.

According to embodiments of the present invention, preferably, PET foam and HPE foam may be used as the core material of the web 10 to minimize blade costs.

According to an embodiment of the present invention, as shown in FIG. 3 , the core material 12 may include a first core material 12a and a second core material 12b. The second core material 12b is located at the lifting point of the web 10, and the strength of the second core material 12b is greater than the strength of the first core material 12a. The lifting point of the web 10 is the main force-bearing point when hoisting the web 10. According to the present invention, by making the strength of the second core material 12b greater than the strength of the first core material 12a, the local structural bearing capacity can be improved, and the lifting capacity can be avoided. The web 10 is damaged when the web 10 is removed.

According to an embodiment of the present invention, the first core material 12a may be PET foam, and the second core material may be balsa wood, for example, balsa wood with a density of 135-176Kg/ ^m3 .

FIG. 5 is a schematic diagram illustrating a method of manufacturing a web according to an embodiment of the present invention. Hereinafter, a method of manufacturing a web according to an embodiment of the present invention will be described with reference to FIG. 5 . To avoid redundancy, descriptions that are repeated with the above descriptions will be omitted.

As shown in Figure 5, the manufacturing method of the web according to the embodiment of the present invention includes: laying the core material 12 and the reinforcement layer in the web mold 33, with the reinforcement layer being provided on both sides of the core material 12; pouring resin, and the resin is polyethylene. Dicyclopentadiene resin system; cures the resin.

First, the core material 12 and reinforcement layers can be laid in the web mold 33 . Specifically, the reinforcement layer located on one side of the core material 12 can be laid on the web mold 33 first. The core material 12 can then be laid. Finally, a reinforcement layer can be laid on the other side of the core 12 .

Next, the core material 12 and the reinforcing layer may be infused with a polydicyclopentadiene resin system, which upon curing forms the polydicyclopentadiene resin matrix described above. According to embodiments of the present invention, the polydicyclopentadiene resin system may include dicyclopentadiene or dicyclopentadiene prepolymer and a catalyst. The dicyclopentadiene prepolymer is formed from dicyclopentadiene and an elastomer that copolymerizes dicyclopentadiene. The dicyclopentadiene prepolymer, catalyst, and the like have been described above, and detailed description will be omitted here.

According to embodiments of the present invention, before injecting the resin, dicyclopentadiene or prepolymer and catalyst may be divided into A component and B component. Component A is dicyclopentadiene or prepolymer, and component B is catalyst. Alternatively, component A is part of the dicyclopentadiene or prepolymer, component B is the catalyst and the remainder of the dicyclopentadiene or prepolymer. Component A and component B can be degassed separately, mixed and then poured. The weight ratio of component A and component B can be 100:0.1~5. Since the integrated pouring system 31 does not require a separate degassing process for the resin in advance, it avoids the temperature rise of the resin caused by degassing after mixing, and also reduces the large number of bubbles introduced by repeatedly pouring the resin, and reduces the pouring caused by the bubbles in the resin. Whitening improves the quality of perfusion.

According to an embodiment of the present invention, when injecting resin, the vacuum system 32 may be used to evacuate and the integrated infusion system 31 may be used to inject resin.

A vacuum system 32 can be arranged outside the web mold 33, and by adjusting the second valve 35, the vacuum level can be set. Due to the low viscosity of the polydicyclopentadiene resin system, if the vacuum degree is set to a large value during the infusion process, the infused polydicyclopentadiene resin can be easily pumped away. According to embodiments of the present invention, the vacuum degree can be set to 0.5-0.8 atmospheres before the resin infusion volume reaches half to prevent the polydicyclopentadiene resin from being pumped away.

According to an embodiment of the present invention, after vacuuming, the integrated infusion system 31 can be used to inject resin.

According to embodiments of the present invention, when injecting resin, the infusion rate of the resin can be gradually increased. As mentioned above, the polydicyclopentadiene resin system has good fluidity due to its low viscosity. In the early stages of infusion, the resin infusion rate should not be too high to prevent the resin from being pumped away. The stability of resin infusion can be ensured by gradually increasing the resin infusion rate.

According to an embodiment of the present invention, the resin infusion rate can be adjusted by controlling the first valve 34, and when injecting the resin, the opening of the first valve 34 can be gradually increased.

According to embodiments of the present invention, considering that the polydicyclopentadiene resin system has low viscosity and good fluidity, the diameter of the resin-infused tube may be 5 mm to 20 mm.

According to embodiments of the present invention, the temperature of resin infusion may be 25°C-35°C. The temperature of the resin infusion may be monitored by a temperature sensor 36 . When the resin infusion temperature is less than 25°C, the fluidity of the polydicyclopentadiene resin decreases. When the resin infusion temperature is higher than 35°C, the polydicyclopentadiene resin will become unstable.

According to embodiments of the present invention, after the infusion is completed, the resin enters the curing stage. As an example, the resin can be kept at 40-60°C for 1-2 hours and then heated to 80-85°C for 3-4 hours.

Specifically, the mold heating program of the web mold 33 can be set to 40-60°C for 1-2 hours (pre-curing), and then raised to 80-85°C for 3-4 hours. During the curing process, the surface of the vacuum bag can be covered with thermal insulation cotton. When the surface exceeds 60°C, it needs to be removed to dissipate heat. After the exothermic peak, the bag must be re-covered. In addition, during the pre-curing process, the resin-filled pipe body and filling port should avoid being covered with insulation cotton to facilitate heat dissipation.

Optionally, after the temperature naturally cools down to below 50° C., demoulding is performed to obtain the web 10 according to the embodiment of the present invention.

One aspect of the present invention may also provide a wind turbine blade including the web 10 as described above.

An embodiment of the present invention may further provide a wind power generator including the wind turbine blades as described above.

As described above, at least one of the following technical effects can be achieved according to the present invention.

According to the present invention, the cost of the polydicyclopentadiene resin system (assembly) used for the polydicyclopentadiene resin matrix is more than 30% cheaper than the epoxy resin system, and each blade web can save 10,000 to 30,000 yuan. , the cost reduction effect is obvious.

According to the present invention, when the polydicyclopentadiene resin system (assembly) is used to infuse the reinforcement layer and the core material to make the web, the viscosity of the polydicyclopentadiene resin system (assembly) at room temperature is small, only 10 to 100 cps. Therefore, its perfusion speed is very fast and can shorten the perfusion time of the web by about 0.5-1.5 hours.

According to the present invention, the polydicyclopentadiene resin does not require post-curing, the curing time is short, and the production efficiency can be greatly improved.

According to the present invention, the density of the polydicyclopentadiene resin system (assembly) is 1.03-1.05g/cm ³ , the density after curing is smaller than the density after curing of the epoxy resin system, and the web is 3-3 light in weight 5%, thus achieving lightweight blades.

In addition, according to the present invention, a method is provided that can solve the process problem of whitening caused by poor wetting when using polydicyclopentadiene resin to form a web.

Although exemplary embodiments of the present invention have been described in detail with reference to the exemplary embodiments thereof, those skilled in the art will understand that they may be modified without departing from the spirit and scope of the invention as defined by the appended claims. Various changes in form and detail.

Claims (16)

1. The web plate is characterized in that the web plate (10) comprises a core material and reinforcing parts (11) respectively arranged at two sides of the core material (12), and the reinforcing parts (11) comprise a polydicyclopentadiene resin matrix and reinforcing layers arranged in the polydicyclopentadiene resin matrix.

2. The web of claim 1, wherein the reinforcing layer comprises at least one of glass fibers, carbon fibers, basalt fibers, aramid fibers, and flax fibers.

3. The web according to claim 1, wherein the core material (12) comprises at least one of holes and grooves into which the polydicyclopentadiene resin matrix extends.

4. The web according to claim 1, wherein the core (12) comprises a first core (12 a) and a second core (12 b), the second core (12 b) being located at a lifting point of the web, the second core (12 b) having a strength that is greater than the strength of the first core (12 a).

5. A method of manufacturing a web, the method comprising:

paving a core material and reinforcing layers in a web plate mould, wherein the reinforcing layers are arranged on two sides of the core material;

pouring resin, wherein the resin is polydicyclopentadiene resin system;

the resin is cured.

6. The method of manufacturing according to claim 5, wherein the step of impregnating the resin includes:

disposing a vacuum system outside of the web mold;

vacuumizing and pouring resin after vacuumizing, wherein the pouring temperature of the resin is 25-35 ℃.

7. The method of manufacturing according to claim 5, wherein the step of curing the resin comprises: preserving heat at 40-60deg.C for 1-2 hr, and heating to 80-85deg.C for 3-4 hr.

8. The method of manufacturing according to claim 6, wherein the step of evacuating comprises: the vacuum was set to 0.5-0.8 atm before the resin infusion reached half.

9. The method according to claim 5, wherein the resin-impregnated tube has a diameter of 5 to 20mm.

10. The manufacturing method according to claim 9, wherein the infusion rate of the resin is gradually increased while the resin is infused.

11. The method according to claim 5, wherein the polydicyclopentadiene resin system comprises dicyclopentadiene or a dicyclopentadiene prepolymer, and the polydicyclopentadiene resin system further comprises a catalyst in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of dicyclopentadiene or a dicyclopentadiene prepolymer.

12. The method of claim 11, wherein the dicyclopentadiene prepolymer is formed from dicyclopentadiene and an elastomer, and wherein the weight ratio of the elastomer to dicyclopentadiene is from 0.01 to 0.7.

13. The method of manufacture of claim 12 wherein the catalyst comprises a ruthenium catalyst, a classical two-component catalyst, a molybdenum phenolic compound or a tungsten-triphenylphosphine complex and the elastomer comprises a thermoplastic elastomer.

14. The method of manufacturing according to claim 11, wherein the method of manufacturing the polydicyclopentadiene resin system comprises:

before infusing a resin, separating dicyclopentadiene or a dicyclopentadiene prepolymer and a catalyst into an A component and a B component, wherein the A component is dicyclopentadiene or a dicyclopentadiene prepolymer and the B component is a catalyst, or the A component is a part of dicyclopentadiene or a dicyclopentadiene prepolymer and the B component is the catalyst and the rest of the dicyclopentadiene resin or prepolymer;

and respectively defoaming the component A and the component B, and then mixing.

15. A fan blade, characterized in that it comprises a web (10) according to any one of claims 1-4.

16. A wind power plant, characterized in that it comprises a wind turbine blade according to claim 15.